So, i will train to explain my problem, i want to install silently my scaner drivers scanwise.exe I made the *.iss and everything is silently but the installation launch something called IM _INS5576._MP(agfa net instalation), the problem is that taskill doesn't work because the instalation is not finish when _INS5576._MP lauch start /wait E:\ScanWise.exe /s /a /s /sms /f1E:\scan.iss taskkill.exe /F /IM _INS5576._MP I hope i have been clear(im french ^^) Thx to all